What does this expression mean: He's got it into his head?

[JayLo]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", question 6

He's got it into his head that we think he's stupid but we really don't.

(a) He seriously contemplates
(b) He seriously ponders
(c) He seriously wonders
(d) He seriously believes

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", answer 6

He seriously believes that we think he's stupid but we really don't.

Correct answer: (d) He seriously believes
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what do you mean?

JayLo

[Alan]

Hi,

Another way of expressing this would be to say: He is convinced/He is absolutely sure.

Alan
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English as a Second Language
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[Yankee]

Convinced.
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Amy
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ESL teacher, translator, and a native speaker of American English

[Alan]

Thank you

A
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English as a Foreign Language
You can read my EFL story Progressive Forms